what power supply?

I'm building a new gaming pc in two weeks and was wondering what power supply I needed. My specs are:
Amd fx 8320 overclocked at 4.5ghz with the noctua nh-d14.
My mobo is gigabyte 990fxa-ud3 and my graphics card is the
Club 3D Radeon HD 7870XT jokerCard. Witch I wil also overclock.
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  1. Best answer
    At a rough estimation, your PC will draw ~500W. You can make better estimation using this tool:

    So I recommend this Seasonic M12II-620 Bronze:

    Good luck!
  2. Your card under extreme load uses around 355w of power (when OC'd) :!-temperature-noise-and-energy-consumption

    and with cpu and rest of system i'd recommend a 500w to 550w of quality psu (seasonic-corsair-Rosewill (capstone edition) ) .

    this would be my recommendation :

    and this :

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